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<div class="title">Miscellaneous Notes on Dw </div> </div>
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<div class="textblock"><p>This is a barely sorted list of issues which I consider noteworthy, but have yet to be moved to other parts of the documentation (which is partly to be created).</p>
<h1>General </h1>
<h2>Widget allocation outside of parent allocation </h2>
<p>A widget allocation outside of the allocation of the parent is allowed, but the part outside is not visible.</p>
<h2>Which widgets may be drawn? </h2>
<p>All drawing starts with the toplevel widget (cf. <a class="el" href="classdw_1_1core_1_1Widget.html#a68e995505b0885143024e3254253f2d8">dw::core::Widget::queueDrawArea</a>, <a class="el" href="classdw_1_1core_1_1Layout.html#a1e65014b2460fb2f66df84eb8b0064cc">dw::core::Layout::queueDraw</a>, and <a class="el" href="classdw_1_1core_1_1Layout.html#a3c685ce77935dacd4416d6b92ad93a77">dw::core::Layout::expose</a>), and a widget has to draw its children, in a way consistent with their stacking order.</p>
<p>There are two exceptions:</p>
<ol type="1">
<li>Direct descendants, which are not children, may be drawn, if the parent can distinguish them and so omit drawing them a second time. See <a class="el" href="classdw_1_1core_1_1StackingContextMgr.html" title="See Handling stacking contexts. ">dw::core::StackingContextMgr</a> and <a class="el" href="dw-stacking-context.html">Handling stacking contexts</a>. Parents should not draw children in flow for which <a class="el" href="classdw_1_1core_1_1StackingContextMgr.html#a64309f6cf7debcb812b3bf909c098b6e">dw::core::StackingContextMgr::handledByStackingContextMgr</a> returns true.</li>
<li>Interrupted drawing: via <a class="el" href="classdw_1_1core_1_1Widget.html#aaebe553117db0b7ba2cb0243d06311df">dw::core::Widget::drawInterruption</a>; see <a class="el" href="dw-interrupted-drawing.html">Interrupted drawing</a>.</li>
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<p>Similar rules apply to handling mouse events (<a class="el" href="classdw_1_1core_1_1Widget.html#aa4eac09454c63d9dc7a8d6a322e7998a">dw::core::Widget::getWidgetAtPoint</a>).</p>
<h2>Interrupted drawing </h2>
<p>→ <a class="el" href="dw-interrupted-drawing.html">Interrupted drawing</a>.</p>
<p>Similar rules apply to handling mouse events (<a class="el" href="classdw_1_1core_1_1Widget.html#aa4eac09454c63d9dc7a8d6a322e7998a">dw::core::Widget::getWidgetAtPoint</a>).</p>
<h2>Extra space </h2>
<p>Should <a class="el" href="classdw_1_1core_1_1Widget.html#a461b61bd42a01e41ccf258db8673d82f" title="Calculates dw::core::Widget::extraSpace. ">dw::core::Widget::calcExtraSpace</a> be called from <a class="el" href="classdw_1_1core_1_1Widget.html#aec23092b0cfe5624b9751a59671fe251" title="Wrapper for Widget::getExtremesImpl(). ">dw::core::Widget::getExtremes</a>? </p>
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